Iphone 一个UICollectionViewCell中的UIImageView数量不定

我需要在一个UICollectionViewCell中显示几个图像。在获取远程照片信息数据之前，我不知道需要创建多少UIImageView。因此，我创建了一个如下所示的单元格：

它可以在此单元格中显示一个或多个图像。但当我滚动UICollectionViewController视图时，有时图像显示正确，有时不正确，有时一个图像覆盖另一个图像。告诉我我的代码出了什么问题？谢谢大家!

#import "ImageViewCell.h"
#import "ImageViewWithPhotoInfo.h"
#import "UIImageView+WebCache.h"
#import <QuartzCore/QuartzCore.h>
#import "GGFullScreenImageViewController.h"


#define ONE_CELL_IMAGE_PADDING 2.f
#define GIF_IMAGE_WIDTH 50.f
#define IMAGEVIEW_BASE_TAG 100
#define GIFVIEW_BASE_TAG 1000
#define HALF_SCREEN ([[UIScreen mainScreen] bounds].size.width-5.f)/2


@interface ImageViewCell(){
    NSUInteger _photoCount;
    UICollectionViewController *parentController;

}


@end

@implementation ImageViewCell


- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
    }
    return self;
}


-(void) setNeededPhotoInfo:(NSDictionary *)photoInfo parentController:(UICollectionViewController*)controller atIndexPath:(NSIndexPath*)indexPath{
    currentIndexPath = indexPath;
    parentController = controller;
    self.photoInfo = photoInfo;
    NSArray *photos = [photoInfo objectForKey:@"photos"];
    NSUInteger count = photos.count;
    if (photos && photos.count) {

        _photoCount = count;

        CGFloat imageViewWidth = HALF_SCREEN - ONE_CELL_IMAGE_PADDING;
        CGFloat currentHeight = 0;
        int i = 0;
        ImageViewWithPhotoInfo *asyncimageView;
        for (NSDictionary *singlePhotoInfo in photos) {

            asyncimageView = [[ImageViewWithPhotoInfo alloc] init];
            asyncimageView.photoInfo = self.photoInfo;
            asyncimageView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
            UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imageViewClicked:)];
            singleTap.numberOfTapsRequired = 1;
            asyncimageView.userInteractionEnabled = YES;
            asyncimageView.photoIndex = i;
            asyncimageView.tag = IMAGEVIEW_BASE_TAG + i;
            [asyncimageView addGestureRecognizer:singleTap];


            NSArray *altPhotos = [singlePhotoInfo objectForKey:@"alt_sizes"];
            int count = altPhotos.count;
            if (altPhotos && count) {
                int fetchLocaltion;
                if (count > 2) {
                    fetchLocaltion = 2;
                }else{
                    fetchLocaltion = count - 1;
                }
                NSDictionary *altPhoto = [altPhotos objectAtIndex:fetchLocaltion];

                if (altPhoto && altPhoto.count) {
                    CGFloat thisHeight = [[altPhoto objectForKey:@"height"] floatValue];
                    CGFloat thisWidth = [[altPhoto objectForKey:@"width"] floatValue];
                    CGFloat rate = imageViewWidth / thisWidth;
                    CGFloat shouldHeight = thisHeight * rate;
                    asyncimageView.frame = CGRectMake( 0, ONE_CELL_IMAGE_PADDING + i * ONE_CELL_IMAGE_PADDING + currentHeight, imageViewWidth, shouldHeight);

                    NSLog(@"currentheight === %f",currentHeight);

                    [self.contentView addSubview:asyncimageView];
                    currentHeight += shouldHeight;
                }

                NSString *url = [altPhoto objectForKey:@"url"];
//                [asyncimageView setImageWithURL:[NSURL URLWithString:url] placeholderImage:[UIImage imageNamed:@"black_image_default.png"]];


                __weak ImageViewWithPhotoInfo *blockAsyncImageView = asyncimageView;

                UIImage *cachedImage = [[SDImageCache sharedImageCache] imageFromMemoryCacheForKey:url];
                if (cachedImage) {
                    asyncimageView.image = cachedImage;
                }else{
                    asyncimageView.image = [UIImage imageNamed:@"black_image_default.png"];
                    [[SDWebImageDownloader sharedDownloader] downloadImageWithURL:[NSURL URLWithString:url] options:0 progress:^(NSUInteger receivedSize, long long expectedSize) {

                    } completed:^(UIImage *image, NSData *data, NSError *error, BOOL finished) {
                        if (currentIndexPath == indexPath) {
                            blockAsyncImageView.image = image;
                        }else{
                            blockAsyncImageView.image = nil;
                        }
                        [[SDImageCache sharedImageCache] storeImage:image forKey:url toDisk:NO];
                    }];

                }


                if ([url hasSuffix:@".gif"]){
                    UIImageView *gifView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"gificon.png"]];
                    CGSize asyncImageViewSize = asyncimageView.bounds.size;
                    gifView.frame = CGRectMake((asyncImageViewSize.width - GIF_IMAGE_WIDTH) / 2, (asyncImageViewSize.height - GIF_IMAGE_WIDTH) / 2 + asyncimageView.frame.origin.y, GIF_IMAGE_WIDTH, GIF_IMAGE_WIDTH);
                    [self.contentView addSubview:gifView];
                }
            }

            altPhotos = nil;
            i++;
            asyncimageView = nil;
        }


    }
    photos = nil;

}

-(void)imageViewClicked:(UIGestureRecognizer *)sender{
    ImageViewWithPhotoInfo *imageView = (ImageViewWithPhotoInfo*)sender.view;
    GGFullscreenImageViewController *vc = [[GGFullscreenImageViewController alloc] init];
    vc.liftedImageView = imageView;
    vc.photoIndex = imageView.photoIndex;
    vc.userInfo = imageView.photoInfo;
    [parentController presentViewController:vc animated:YES completion:nil];
}

#导入“ImageViewCell.h”
#导入“ImageViewWithPhotoInfo.h”
#导入“UIImageView+WebCache.h”
#进口
#导入“GGFullScreenImageViewController.h”
#定义一个单元格\u图像\u填充2.f
#定义GIF\u图像\u宽度50.f
#定义IMAGEVIEW_BASE_标签100
#定义GIF视图\基础\标记1000
#定义半屏幕（[[UIScreen mainScreen]边界].size.width-5.f）/2
@接口ImageViewCell（）{
NSU整数光计数；
UICollectionViewController*父控制器；
}
@结束
@ImageViewCell的实现
-（id）initWithFrame:（CGRect）帧
{
self=[super initWithFrame:frame]；
如果（自我）{
}
回归自我；
}
-（void）SetNeedPhotoInfo:（NSDictionary*）photoInfo父控制器：（UICollectionViewController*）控制器atIndexPath:（NSIndexPath*）indexPath{
currentIndexPath=indexPath；
父控制器=控制器；
self.photoInfo=photoInfo；
NSArray*照片=[photoInfo objectForKey:@“照片”]；
NSU整数计数=photos.count；
如果（照片和照片计数）{
_光电计数=计数；
CGFloat IMAGEVIEWWITH=半屏幕-一个单元格\u图像\u填充；
CGFloat currentHeight=0；
int i=0；
带有PhotoInfo*异步图像视图的图像视图；
用于（NSDictionary*照片中的singlePhotoInfo）{
asyncimageView=[[ImageViewWithPhotoInfo alloc]init]；
asyncimageView.photoInfo=self.photoInfo；
asyncimageView.autoresizingMask=UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth；
UITapGestureRecognizer*singleTap=[[UITapGestureRecognizer alloc]initWithTarget:自操作：@selector（imageViewClicked:）]；
singleTap.numberOfTapsRequired=1；
asyncimageView.userInteractionEnabled=是；
asyncimageView.photoIndex=i；
asyncimageView.tag=IMAGEVIEW\u BASE\u tag+i；
[asyncimageView AddGestureRecognitor:singleTap]；
NSArray*altPhotos=[singlePhotoInfo objectForKey:@“alt_尺寸”]；
int count=altPhotos.count；
如果（备用照片和计数）{
int-fetchlocalation；
如果（计数>2）{
fetchLocation=2；
}否则{
fetchLocation=count-1；
}
NSDictionary*altPhoto=[altPhotos objectAtIndex:fetchLocation]；
if（altPhoto&&altPhoto.count）{
CGFloat thisHeight=[[altPhoto objectForKey:@“height”]floatValue]；
CGFloat thisWidth=[[altPhoto objectForKey:@“width”]floatValue]；
CGFloat rate=imageViewWidth/thisWidth；
CGFloat shouldHeight=此高度*速率；
asyncimageView.frame=CGRectMake（0，一个单元格图像填充+i*一个单元格图像填充+currentHeight，imageViewWidth，shouldHeight）；
NSLog（@“currentheight===%f”，currentheight）；
[self.contentView addSubview:asyncimageView]；
当前高度+=应高度；
}
NSString*url=[altPhoto objectForKey:@“url”]；
//[asyncimageView setImageWithURL:[NSURL URLWithString:url]占位符图像：[UIImage ImageName:@“black_image_default.png”]；
__弱ImageViewWithPhotoInfo*blockAsyncImageView=asyncimageView；
UIImage*cachedImage=[[SDImageCache sharedImageCache]imageFromMemoryCacheForKey:url]；
if（缓存图像）{
asyncimageView.image=cachedImage；
}否则{
asyncimageView.image=[UIImage ImageName:@“black_image_default.png”]；
[[SDWebImageDownloader sharedDownloader]DownloadeImageWithURL:[NSURL URLWithString:url]选项：0进度：^（NSUInteger receivedSize，long-long-expectedSize）{
}已完成：^（UIImage*图像，NSData*数据，NSError*错误，布尔已完成）{
if（currentIndexPath==indexPath）{
blockAsyncImageView.image=图像；
}否则{
blockAsyncImageView.image=nil；
}
[[SDImageCache sharedImageCache]storeImage:image-forKey:url-toDisk:NO]；
}];
}
如果（[url hasSuffix:@.gif”]）{
UIImageView*gifView=[[UIImageView alloc]initWithImage:[UIImageName:@“gificon.png”]；
CGSize asyncImageViewSize=asyncimageView.bounds.size；
gifView.frame=CGRectMake（（asyncImageViewSize.width-GIF\u IMAGE\u width）/2，（asyncImageViewSize.height-GIF\u IMAGE\u width）/2+asyncimageView.frame.origin.y，GIF\u IMAGE\u width，GIF\u IMAGE\u width）；
[self.contentView addSubview:gifView]；
}
}
altPhotos=零；
i++；
asyncimageView=nil；
}
}
照片=无；
}
-（无效）imageViewClicked:（UIgestureRecognitor*）发件人{
ImageViewWithPhotoInfo*imageView=（ImageViewWithPhotoInfo*）sender.view；
GGFullscreenImageViewController*vc=[[GGFullscreenImageViewController alloc]init]；
vc.liftedImageView=imageView；
vc.photoIndex=imageView.photoIndex；
vc.userInfo=imageView.photoInfo；
[parentController presentViewController:vc动画：是完成：无]；
}

查看AFNetworking library，它对于进行网络呼叫非常有用。AFNetworking还提供了

[imageView setImageWithURL:[NSURL URLWithString:@"…"]];